Electrically programmable memory cell
First Claim
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1. Electrically programmable cell comprising:
- a substrate of a first conductivity type, having a channel region having a first side and a second side;
a control gate located on a first insulating layer above the channel region;
a drain region of a second conductivity type located on the substrate adjacent to the first side of the channel region, the drain region having a low-doped region adjacent to the channel region;
a source region of the second conductivity type located on the substrate adjacent to the second side of the channel region;
an insulated floating gate located on a second insulating layer above a portion of the drain region, the insulated floating gate being disposed such that it does not extend over the channel region.
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Abstract
An electrically programmable cell comprises a substrate of the first conductivity type having a channel region, a control gate on a first insulating layer above the channel region, a source region and a drain region of a second conductivity type, on both sides of the channel region, at least the drain region including a low-doped region adjacent to the channel, a floating gate on a second insulating layer above at least a portion of said low-doped region. The thickness of the second insulating layer is lower than the thickness of the first insulating layer and is low enough for having charge transfers through tunnel effect.
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Citations
17 Claims
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1. Electrically programmable cell comprising:
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a substrate of a first conductivity type, having a channel region having a first side and a second side; a control gate located on a first insulating layer above the channel region; a drain region of a second conductivity type located on the substrate adjacent to the first side of the channel region, the drain region having a low-doped region adjacent to the channel region; a source region of the second conductivity type located on the substrate adjacent to the second side of the channel region; an insulated floating gate located on a second insulating layer above a portion of the drain region, the insulated floating gate being disposed such that it does not extend over the channel region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17)
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12. An electrically programmable cell comprising:
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a substrate of a first conductivity type having a semiconductor face including a channel region, the channel region having first and second sides and an upper surface; a first insulating layer disposed over the channel region; a control gate disposed over the first insulating layer and disposed over the upper surface of the channel region of the semiconductor face; a drain region of a second conductivity type disposed over the semiconductor face adjacent the first side of the channel region; a source region of the second conductivity type disposed over the semiconductor face adjacent to the second side of the channel region; an insulated floating gate disposed over the semiconductor face such that the insulated floating gate encircles the control gate; and a second insulating layer disposed between the drain region and the insulated floating gate. - View Dependent Claims (13, 14, 15, 16)
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Specification